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Published on: 28/08/2019
Laws of Motion
Download CBSE Class 11th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 11th Standard CBSE Physics
Questions + Answers key
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1.
Why is static friction called a self-adjusting force?
2.
An impulse is applied to a moving object with a force at an angle of 20\(^0\) w.r.t. velocity vector. what is the angle between the impulse vector and change in momentum vector ?
3.
If force is acting on a moving body perpendicular to the direction of motion, then what will be its effect on the speed and direction of the body ?
4.
A force of 36 dyne is inclined to the horizontal at an angle of 60\(^0\) . Find the acceleration in a mass of 18 g that moves in a horizontal diraction.
5.
The distance travelled by a moving body is directly proportional to time. Is any external force acting on it ?
6.
A force of 200 N is required to push a car of mass 500 kg slowly at constant speed on a level road. If a force of 500 N is applied, the acceleration of the car (in m S-2) will be_______.
zero
0.2
0.6
1.0.
7.
Action and reaction _______.
act on two different objects
have equal magnitude
have opposite directions
all are correct
8.
A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. Force P is applied at one end of the rope. The force which the rope exerts on the block is: _______.
\({P\over M-m}\)
\({PM\over m+M}\)
\({P\over M(m+M)}\)
\({Pm\over M-m}\)
9.
The dimension of Impulse is _______.
MLT-2
MLT-1
MLT-3
MLT
10.
If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator may _______.
going up with uniform speed
going down with non-uniform speed
going up with increasing speed
going down with increasing speed
1.
As the applied force increases, the static friction also increases and becomes equal to the applied force to make the object stationery. That is why static friction is called a self-adjusting force.
2.
Impulse and change in momentum are along the same direction. Therefore, angle between these two vectors is zero degree.
3.
No change in speed, but change in direction is possible. Forces acting on a body in circular motion is an example.
4.
Given, F = 36 dyne at an angle of 6000 .
∴∴ Component of force along x-direction
Fx = F cos 6000 = 36 x 1/2 = 18 dyne
But Fx = max ,
ax = \(\frac{F_x}{m} =\frac {18}{18} = 1\) cm/s2
5.
When S ∝ t, so acceleration = 0, Therefore, no external force is acting on the body.
6.
(d)
1.0.
7.
(d)
all are correct
8.
(b)
\({PM\over m+M}\)
9.
(b)
MLT-1
10.
(a)
going up with uniform speed
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